A NEW SYSTEM OF TOOLS FOR BETTER CONTROL AND INTERPRETATION OF DRILL STEM TESTS

Abstract

The Multi-Flow Evaluator, MFE, is a new system of tools providing an original approach in drill stem testing. It improves control during the testing operation and gives a more accurate evaluation of the fluid recovered while providing additional pressure information for reservoir analysis.

The tools are operated entirely by up and down motion of the drill stem. This up and down operation provides a positive means of control and offers easily observed surface indications of tool operating position. An unlimited number of shut- in and flow periods may be taken with this tool while in the hole.

The key to the success of the MFE system of tools is the safety seal packer. Until this development, operation of the tools by up and down motion only, had proven unreliable. The success ratio of the MFE now exceeds the ratio achieved by conventional tools.

The equipment includes a 2500 cc chamber In which a representative sample of the flowing formation fluid Is trapped at the end of the last flow period and brought to the surface under pressure. The sample can be evaluated at the well site or transferred under pressure for laboratory analysis.

The sampling feature of the tool allows a sample to be obtained from a reservoir which has suffered minimum Influence from production. A representative sample can be obtained for laboratory or empirical analysis by employing a testing technique to minimise draw-down during flow periods.

Interpretation methods to take advantage of this additional information are presented and supported by actual field examples.